Sewing-machine bobbin-winder.



" earner omen.

MARTIN HEM'LEB, 01av ELIZABETH, ,N wJnnsnYj-AssmNon TO THE SINGER MANUFAC- TUBING COMPA Y, A CORPORATION" or NEW JERSEY.

. I I v SEWING-MACHINE BbBBIN-WINDER Specification of Letters Patent. Patented Aug. 311, 1915i.

.Appli 'cation'filed August is 1914. Serial No. 857,291.

To an whom it may. concern; v Be it known that I, MARTIN. H'EMLEB, a citizen of the United States, residing at Elizabeth, in the county of Union and Stateof vNew Jersey, haveinvented certain new and useful Improvements in Sewing-Mahine Bobbin-Winders, of which the follow a: is a specification, reference being had therein to the accompanying drawings.

My invention relates to sewing machine hobbin-winding'devices and particularly to that type of devices adapted to be driven through direct contact with the balance wheel otthe machine, the object of the invention being to improve the construction subject of my-applica'tion filedAugust 21, 1913, Serial'No. 785,844. In the construction ofthe aforesaid. application, the friction-wheel for the bobbin driving spindle may beprovided with a. non-resilient rim,

' inasmuch as the spring pressure ofa latch- 4 ing the grooved hub t ng coiled spring which tends to .force the arm flupwardly and thereby to carry the friction- "carrying lever is transmitted thereto to 'se-'' cure the necessary contact between it and 'the annular runway of the sewing machine balance-wheel. In the present invention the advantages of the former structu're'are retained, while the need-for the latch-carrying lever is' obviated, a latchbeing employed solely as a detent-member to hold the spindle and .friction-wheel in position during the bobbimwin-ding operation.

In the present construction, the bobbindriving spindle and friction-wheel .of the device are car'riedjby a swinging arm pivotally mounted upon a belt-guard overhangof the balance-wheel andin such position that the non-resilient rim of the friction wheel may be brought into contact with 'a runway'formed upon the 4m hub'of the said balance-wheel. Intermediate arm and the belt-guard is a wheel out of contactwith'the runway. The

swingingarmi is -held .in operative position,

againstthe. action... ofits spring, by means 0th luiifi fi which is-adapted to be automatieleesed trom and arm at the end-.of

' friction-wheel is secured to the bobbin-winding spindle tlirough the intermediary of a.

spring-steel pin, the latter being clamped at one end within an annular chamber formed in the spindle so that it may yield slightly with the friction-wheel when the latter is brought into contact with the runway. The latch for the swinging arm is so constructed that it may be adiusted to vary the operative position in which the arm is held. so that g the steel pm may be deflected a greater or a less degree and its spring pressure upon the frictirin-whee'L-which insures the firm'contact of the wheel with the runway-varied at will.

vation of the improvements as applie'dto a In the drawings, Figure 1 is a front ele-j sewing machine. Fig. 2 is a side elevation of the improvements showing the same mounted upon the belt-guard of'the sewing machine. and Fig. 3 is a plan view of the same. Fig. 4 illustrates the swinging arm in detail and Fig. 5 illustrates the latch device in detail. Fig. 6 is a longitudinal section through the bearing boss of the swinging arm, and the spindle contained therein, showing the friction-wheel and its'supporting pin'in normal position.

The belt-guard 1 which affords a support for the bobbin-winding attachment is secured upon a bearing boss 2 at the rear of the sewing machine standard A, the beltguard being held in place by set-screw 3"so that it overhangs the usual annular beltgroove 4: of the balance-wheel 5, the latter being provided with an annular runway 6 which serves as a contact surface for the friction-wheel-Of the bobbin-Winder.

The belt-guard 1 is threaded to receive a stud-screw 7 by which the swinging an aperture formed in the swinging arm,

arm 25. thread it presses outwardly upon the anandthe opposite end of the spring beingheld by the guard, so that a spring-pressure is'exerted upon the arm tending to force the same upwardly from the position shownin Fig.2. The arm is provided with an angular boss 8", the bearing aperture 12 of which is adapted to receive a bobbin driving spindle 13, the boss being provided with seats at each end to receive the fianged end 1 1 of the spindle and a collar 15 by means ofvhich the s indle is held against endwise movement within the boss.

A'longitudinal chamber 16 is formed in the spindle 13 and terminates in an aperture of decreased diameter in which is fitted the end of a steel pin 17 which carries at its opposite end the friction-wheel 18 through the instrumentality of which the spindle 13 is rotated by the balance-wheel 5. The pin 17 is clamped in position within the spindle 13 by means of a clamping screw 19 which serves also to secure the collar 15 upon the spindle.

degree to insure the transmission of power from the balance-wheel to the bobbin-driving spindle 13. To hold the swinging arm in its operative position, and to automatically release the same at the end of a bobbinwinding operation,- a latch 22 is provided. Thelatch is pix'otally mounted directly upon the belt-guard 1 and for this purpose it is apertured at 28 to receive the stud-screw 24,

and a spring (not shown surrounding the stud-screw 24-, one endof the spring being held by the belt-guard and the opposite end fitted within an aperture 22 in the latch. The spring tends to move the latch downwardly so that its tooth t will pass over the upper face of boss 8 when the swinging arm is moved into operative position. The latch is provided with the usual-angular releasing As the bobbin becomes filled with gular arm 25 until, at the completion of the v The collar 15 is provided with a short stud 20 which fits within an aperture bobbin-winding operation, the detaixjing .the degree of yield of wheel 18 against the action of the spring-pin 17. To vary. the operative position of the arm and thereby to change the spring pressure of the frictionwheel upon therunway 6, the upper toothed portion 22 of the latch 22 is adjustable upon the body portion thereof. In the present instance the toothed-portion 22 of the latch is formed with a short slot sto receive the threaded shank of the clamping screw 26 which is held by the body portion of the latch, the latter portion also being slotted to receive the guide-lug 27 projecting from the inner face ofthe toothed-portion 22*. It will be seen without further explanation that the aforesaid construction permits ample adjustment of the latch device.

Various changes maybe made in the form and arrangement of the elements herein shown and described without departing from the spirit of the invention. For example the swinging arm 8 and the bearing boss 8 are shown formed integral with a guard 28 which overhangsthe friction-wheel18. it is manifest that this construction,'while desirable, may be altered without affecting the operation of the device. It is exident also that the spring-yielding support for the frictionwheel may be changed inits form without affecting its function as described.

Having thus set forth the nature of the invention, what I claim herein is 1. A bobbin-windercomprising a swinging arm, a spindle anl a driving wheel therefor carried by said arm, a spring acting to move the arm in a given direction, a latch device for holding said arm in opposition to its spring, and a spring-yielding connection between said spindle and its driving wheel.

2. A bobbin-winder comprising a movable arm provided with a bearing boss, a spirxle journaled within said boss and formed with a chamber, a spring held within said chamber. a driving wheel secured to said spring, and a detent device for holding said arm in a given position. I

3. A bobbin-winder comprising a swinging arm formed with an angular extension having an upper wall overhanging a central aperture, a spindle journaled Within said aperture and formed with an axial chamber, a yieldable pin held within said chamber for. lateral'niovement relatively thereto, a;- device-edepted to hold iarm'ifie driving wheel secured to said pin below the lectediposition in' oppo'sl 1on"to.its spr ng." said overhangingwall, and a; detent device In testimony whereof; v ave signed my for holding said arm inf given position. name'to this specification, in the presence of 5 4. A bobbin-winder comprising a; swingtwo subscribing witnesses.

. ing arm, a spindle and a driving wheel therev T N- W for carried by said arm, a spring acting to i r L I move the arm in a given direction; a spring Witnesses: 1 yielding connection between the spindleaind LEE'HELM S, g Y

10' its driving wheel, and-an edjustable latch HENRY A. KOBNEMANN, Jr 

